Rockwell Automation 1761-HHP-B30 MicroLogix 1000 with Hand-Held Programmer (HHP) - Manual (Page 358)

After You’ve Entered Your Program
Chapter 18
18–37
Forcing an External Output Circuit
A forced external output circuit is independent of the internal logic of the
program and the output data file. Setting forces on output circuits affects
only the output circuit. Set forces do not affect the output data file or the
program logic. The effects of set forces can be seen from the program
monitor and the data monitor functional areas only while in RRUN. (RCSN
and RSSN do not energize output circuits.)
The following is an example program monitor display of instruction O/1 in
rung 1. The display indicates that the controller is in RRUN and no forces
exist.
R 0 0 1
O / 1 0
The procedure for forcing external output circuits is the same as forcing
external input data file bits.
1. Press the force On key. A confirmation screen appears.
FON
C
-
F O R C E B I T O N ?
Y E S [ E N T ] N O [ E S C ]
2. Accept the confirmation to force the bit On.
ENT
R 0 0 1 F O N
O / 1 0
For the display shown above, the following is now true:
•
Output O/1 is forced On; however, the instruction state box is not filled
because the instruction is not logically true.
•
The controller’s output LED is on.
•
The controller’s Forced I/O LED is on continuously.